12-28-2011, 11:50 AM
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#1
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Registered User
Join Date: Aug 2004
Location: Alta Loma, CA
Posts: 1,334
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Thinking about this 
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12-28-2011, 11:57 AM
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#2
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Registered User
Join Date: Aug 2004
Location: Alta Loma, CA
Posts: 1,334
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Funny part? I run the cable cars with the MAF disconnected pretty regularly. The base map in the ecu is pretty damn good..
Still thinking. Everything you posted makes perfect sense. I understand what we are doing (I'm not using this on anything smaller than a 3.2) but I will in the future.
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12-28-2011, 12:00 PM
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#3
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Porscheectomy
Join Date: Mar 2006
Location: Seattle Area
Posts: 3,011
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Quote:
Originally Posted by Brad Roberts
Funny part? I run the cable cars with the MAF disconnected pretty regularly. The base map in the ecu is pretty damn good..
Still thinking. Everything you posted makes perfect sense. I understand what we are doing (I'm not using this on anything smaller than a 3.2) but I will in the future.
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The base map with the MAF disconnected probably runs fuel metering off the throttle position sensor. So it's probably fine as long as you don't mess with the cylinder filling efficiency of the engine (very free flowing exhaust and intake) and you don't change the size of the throttle body. If you do those, it'll probably go lean again. But the non-MAF map is probably conservative to begin with so it might bring the fuel level to about right.
Last edited by blue2000s; 12-28-2011 at 12:03 PM.
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12-28-2011, 12:08 PM
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#4
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Registered User
Join Date: Aug 2004
Location: Alta Loma, CA
Posts: 1,334
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Correct. TPS metering. The throttle response is not as crisp when I have them disconnected.
I have seen multiple cars adapt upwards of 20hp with no computer change, knowing that we changed the plenum (after MAF changes)
Typing out loud
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12-28-2011, 12:11 PM
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#5
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Porscheectomy
Join Date: Mar 2006
Location: Seattle Area
Posts: 3,011
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Quote:
Originally Posted by Brad Roberts
Correct. TPS metering. The throttle response is not as crisp when I have them disconnected.
I have seen multiple cars adapt upwards of 20hp with no computer change, knowing that we changed the plenum (after MAF changes)
Typing out loud
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With safe AFR's?
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12-28-2011, 12:11 PM
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#6
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Registered User
Join Date: Aug 2004
Location: Alta Loma, CA
Posts: 1,334
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I'll install one of these on a stock 3.2 engine with headers with a before and after A/F readings. I have a gutted stripped 3.2 race car in the shop that will be easy to install one on. I'm pulling the engine this week anyway!
B
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12-28-2011, 12:12 PM
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#7
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Porscheectomy
Join Date: Mar 2006
Location: Seattle Area
Posts: 3,011
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Quote:
Originally Posted by Brad Roberts
I'll install one of these on a stock 3.2 engine with headers with a before and after A/F readings. I have a gutted stripped 3.2 race car in the shop that will be easy to install one on. I'm pulling the engine this week anyway!
B
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That should be interesting. Hopefully it's interesting, anyway.
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12-28-2011, 12:12 PM
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#8
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Registered User
Join Date: Aug 2004
Location: Alta Loma, CA
Posts: 1,334
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Porsche runs these super lean anyway, but yes, more than safe.
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12-28-2011, 02:50 PM
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#9
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Registered User
Join Date: Sep 2011
Location: Reno, NV
Posts: 148
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Quote:
Originally Posted by Brad Roberts
Porsche runs these super lean anyway, but yes, more than safe.
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Brad, do you think I'm safe to run the stock tune with the 987 box and stock throttle body? I plan to upgrade the TB and plenum at a later date, and probably headers, then tune it to match.
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